Grinding wheel



Malyy 21, 1940. H. R. slMoNDs GRINDING WHEEL Filed Feb. 15. 1939 j 0%7 oww. @7,

Patented May 21,

GRINDING WHEEL Wheel. It is desirable that such a Herbert R. Simonds, Dayton,

White Company,

Simonds Worden Ohio, assignor to Dayton,

2 Claims.

to a grinding wheel and grinding wheel having its side or flat surface of the grinding wheel 5 should have a non-continuous grinding face, that is, that different parts of be spaced one from the grinding face should the other, to prevent excessive heating and to provide for the escape of iine material which is separated from the grinding wheel and from the work during the grinding operation.

One object of simple eiilcient method the invention is to provide a of producing a grinding wheel having a non-continuous lateral grinding face.

A further object of th a grinding wheel having a e invention is to provide plurality of grinding elements so arranged and connected one to the other as to provide a strong durable grinding In the accompanying drawing Fig. 1 is a side elevation, partly broken away, of a grinding wheel embodying my invention;

1; and Fig. 3 is a similar on the line 2-2 of Fig.

section of a portion of the Fig. 2 is a section taken grinding wheel showing the same as mounted on the head of the grinding wheel.

In this drawing ment ofthe invention but that this embodiment has purposes of illustration I have illustrated one embodiit will be understood been chosen for the only and that the details of construction may take various forms,

The grinding wheel comprises a plurality of grinding elements 5,

preferably arcuate in form and arranged in radially spaced relation one to the other with their grinding faces, a common plane transverse to the tion of the wheel. As h or edges, in axis of rotaere shown, each arcuate grinding element comprises a complete circle, the

several elements being of being spaced radially one vide between adjacent space t.

The several different diameters and from the other to proelements an annular grinding elements are rigidly connected one to the other adjacent those edges thereof which are remote from the grinding edges or faces. This is preferably accomplished by mounting the grinding plate 'l which may be o elements on a backing f steel or other suitable material and which preferably is of the same diameter as the outside diameter of the outermost arcuate grinding element. There may be any suitable number of grinding elements and they may be arranged on the backing plate in any 5 suitable manner which will provide the desired non-continuous grinding face and which will permit the wheel to be maintained in balance. As here shown, three circular grinding elements are arranged concentric with relation one to the other and to the axis of the wheel and are of such width as to provide between them the annular space 6.

In order that the grinding elements may be easily but rigidly attached to the backing plate in such a manner as to provide a strong durable wheel at a low cost I prefer that the backing plate shall be of such character that the grinding elements can be molded directly thereon in such a manner as to firmly unite the grinding elements and the backing plate. As is well understood the grinding elements are usually produced by mixing an abrasive substance or grain with a suitable binder to provide a plastic material which can be molded to the desired form and is then baked or otherwise treated to harden the same. In the present construction the recesses are shown as annular, dovetailed grooves 8 formed in the backing plate and each grinding element has at its inner edge a dove-tailed portion 9 Iitting tightly within the corresponding dove-tailed groove. In the manufacture of the wheel the backing plate is placed in a suitable circular mold provided with partitions arranged to divide the grinding material into separate elements of the desired character. The plastic grinding material is introduced into the mold and pressed rmly into the dove-tailed recesses in the backing plate, the various spaces in the mold being iilled to a common level so that the grinding faces of the ,b several grinding elements will be in a common plane. After the mold has been iilled the formed grinding wheel is removed therefrom and baked or otherwise treated to properly harden the grinding elements. i.

The finished wheel may be mounted for rotation in any suitable manner but, as here shown, it is rigidly secured to the rotating head I0 of a grinding machine, as by means of screws Il.

It will be apparent that in the grinding wheel 50 so produced the several grinding elements are spaced one from the other to provide a noncontinuous grinding face and are rigidly secured to the backing plate so that the wheel as a whole, including the grinding elements and the backing plate. may readily secured to and removed from the rotating head oi the grinding machine. It will be understood that while prefer to use circular grinding elements these elemente .may

be segmental in form or otherwise arranged to provide the desired surface.

While I have shown and described one embodiment of my invention I wish it to loe understood plurality of annular grooves arranged concentric one with the other and with the axis of rotation of said backing plate, said grooves being of a depth less than the thickness of said backing plate and having enlarged inner portions, a plurality of one piece annular grinding elements oi' bonded abrasive material molded in the respective grooves, extending outwardly there asoma@ from in radiaiily spaced relation ene to the other and having on their outer edges annular grinding surfaces spaced radially one trom the other.

2. in a grinding wheel. a disk-Elite rotatable backing plate having means for rigidly seeming the saine to a driving element and having in one face thereof a pluraiityfoi annular grooves arranged about and spaced different distances from the aids of rotation of said backing plate, said grooves being 0f a depth less than the thickness of said backing plate and having their inner portions enlarged, and a plurality o! grinding elements each comprising a body of bonded abrasive material having a relatively narrow inner edge portion thereof molded in one o1' said grooves and having on opposite sides of said narrow portions inwardly facing shoulders arranged in supporting contact with said backing plate, each grinding element having at its outer edge a continuous grinding surface land the grinding surfaces of the several grinding elements being arranged in a common plane and spaced radially one from the other.

HERBERT R. SFMONDS. 25 

